I believe we should respect but not give the same rights we give any other animal to insects and arachnids. I'm all for laws that protect endangered species of insects, and I believe that there should be laws prohibiting people from placing two incompatible insects or arachnids together in the same enclosure for amusement; but I think it would be ridiculous if someone was charged $1000 dollars each time they accidentally stepped on a cricket walking to and from work or if there was a police investigation each time someone killed and flushed a spider down the toilet in their own home.
However, I do believe it is shameful to go out of your way to kill something when you could have easily ignored it or released it outside; but I believe in some cases it is justified, such as using medicine to kill the fleas off your dog or pest control to keep your house from becoming over-infested with any dangerous or aggressive species of insects and arachnids (especially if you have people living in your house that are more prone to dying or falling incredibly ill from the bite or sting of a venomous insect like little children or the elderly) - or just other general pests like bed bugs and termites.